White Mountain Textiles Bed Bug Covers are lab-tested and certified to be bed bug proof. Thanks to their quality construction and special barrier fabric, they effectively protect your mattress, box spring and pillows from bed bugs and their bites. Bed bugs can bite through most woven bedding. Our White Mountain Textiles bed bug covers are made from a special stretch knit fabric that has a polyurethane barrier layer. This laminate barrier layer is impenetrable to bed bug bites as well as dust mite and their allergens. They also use a heavy duty zipper that stops bed bugs from escaping an infested bed and prevents a new mattress from becoming infested. The mattress and pillow covers have a soft jersey cotton-like surface feel that is completely quiet and comfortable to sleep on. The box spring covers are made of a polypropylene fabric that features the same polyurethane barrier layer for equal protection. The unique polyurethane barrier layer is breathable for comfort and 100% waterproof to protect against stains and spills.